Two lines, two scales, one graph
On Mon, 24-Aug-2009 at 08:00AM -0700, Rick wrote:
First of all, thanks to everyone who answers these questions - it's most helpful. I'm new to R and despite searching have not found an example of what I want to do (there are some good beginner's guides and a lot of complex plots, but I haven't found this). I would like to plot two variables against the same abscissa values. They have different scales. I've found how to make a second axis on the right for labeling, but not how to plot two lines at different scales.
The idea is that you rescale the second lot of y values to fit into the same range as the first lot. If your first ones range from 0 to 10 and your second ones from 0 to 1000, you do the second line (using the lines() function) by dividing every value by 100 and I think you will have found how to use axis with side = 3 to do the axis. If the zeros don't coincide, you need to make further adjustments which should become obvious. HTH
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___ Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) ..... Eleanor Roosevelt
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